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NEWS
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Issue 21, October 2009
Page 1
CTI 2500 PROCESSORS NOW CLASS 1 DIVISION 2
CERTIFIED
Control Technology Inc have received final approval to classify the CTI 2500-Cxxx Processors for Class 1 Division 2
Groups A, B, C and D Hazardous Locations Certification. The full comprehensive CTI 2500 Series™ product listing
is available on the UL Online Certifications Directory (Certificate NRAG.305321) via the following link
(Programmable Controllers for Use in Hazardous Locations)
The category covers Industrial Control Equipment, Programmable Controllers for Use in Hazardous locations.
Equipment for use in Class 1 hazardous (classified) locations, as defined in the NEC, is tested with respect to
acceptability of operation in the presence of flammable and explosive mixtures of specific vapors and gases with air.
For the purposes of location classification for Divisions 1 and 2, such mixtures have been grouped on the basis of their
characteristics as follows:
Class I, Group A — Atmospheres containing acetylene.
Class I, Group B — Atmospheres containing gases or vapors having
either a maximum experimental safe gap (MESG) less than or equal to
0.45 mm or a minimum igniting current ratio (MIC ratio) less than or
equal to 0.40. Examples of Group B materials are acrolein, butadiene,
ethylene oxide, propylene oxide, hydrogen, and fuel and combustible
process gases containing more than 30% hydrogen by volume.
Class I, Group C — Atmospheres containing gases or vapors having
either a maximum experimental safe gap (MESG) greater than 0.45 mm
and less than or equal to 0.75 mm, or a minimum igniting current ratio (MIC ratio) greater than 0.40 and less than or
equal to 0.80. Examples of Group C materials are ethyl ether and ethylene.
Class I, Group D — Atmospheres containing gases or vapors having either a maximum experimental safe gap
(MESG) greater than 0.75 mm or a minimum igniting current ratio (MIC ratio) greater than 0.80. Examples of Group
D materials are acetone, ammonia, benzene, butane, cyclopropane, ethanol, gasoline, hexane, methane, methanol,
naphtha and propane.
For additional information, see Equipment for Use in and Relating to Class I, II and III, Division 1 and 2 Hazardous
Locations (AAIZ) or visit the Underwriters Laboratories website. (www.ul.com) .
UL is a registered trade mark of Underwriters Laboratories Inc
Pilz, SafetyBUS p,PNOZ are registered trademark of Pilz GmbH & Co. KG.
Profibus logo is a registered trade mark
Parker is a registered trademark of Parker Hannifin Corp.
Siemens and SIMATIC is a registered trademark of Siemens AG.
5TI, Series 505, PM550 and TISOFT are trademarks of Siemens Energy & Automation Inc.
TI505, TI525, TI535, TI565 and TI545 are trademarks of Texas Instruments Incorporated.
Belden is a registered trademark of Belden Inc.
CTI and CTI 2500 Series is a registered trademark of Control Technology Inc.
CitectSCADA is a registered trademark of Schneider Electric (Australia) Pty Ltd
FasTrak, and PLC Workshop is a registered trademark of FasTrak SoftWorks, Inc.
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